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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec7ad14e75c4606729fcd16d7143938b68ecc7030ee36562a23f702bdcd9f24' 
  AND token = '693xWTH47k67I3bNdBckHOPxCIJ1QHYoreEiR7EueEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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