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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65cdf106d8d07c9ab59889ee49b7a8b63dfb05b3e8cbf85a636794565f2b83f5' 
  AND token = 'sJA73Dd48k8mOvmEcqjMjxMKPVzg3fftshOCWp7pjlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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