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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af3b3a0d8a64cc87a6cd5a24b84bc8ac66485a9aa31516cf76d0076f91b16146' 
  AND token = 'f47RoJ5G4VravGJ8omrjTJMiTvv4DsnTkUEoYYKP+3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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