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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74ab93246aeb740dec75749960f8a0bc9a1ccb6c2310915977d980c37caf36cf' 
  AND token = 'e3/9bnOBCVLNlDl8LNT9O8yvI8uHSUgC/Ty3EpH+nPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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