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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29d1ef9c45e84241d44fe207b4ef2be38cdeecc38468093b214ca6bd707255e9' 
  AND token = 'EP1HDPmGPw1Bbx+/GlEqiKI8zqdi61mfeDVu8KyA+OY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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