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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52962c73552860876d1f0b91a678a599ea30d7a575cea9dbc58218d7ab5d9df8' 
  AND token = 'lmfxktf1YlYgU9T7G9zHAfSBOPJxtZ65rpvGzrlPs98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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