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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec7fc546f8a9ac827efa017d9cdd6472ec3acfd76e31aa092f777a6b3a3aeff0' 
  AND token = 'sXK5uWi6vZMuZXWOQeD8W/LKIM320rAR22kbGP0wTdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}