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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae9f6ba69985b6106ca78e86cfaa4cd37506e443c25cdf89be861bb36401fca4' 
  AND token = 'CUzOUrorYLaN4lj4FgoiK7Hj7Y+MHxGTU1Sf7nFqtZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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