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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '279005d0e64d37aad46eb9e919c30d9e9647e588316c31b399da4c35fca1fbc2' 
  AND token = 'G28oSABj8LrGrB8tosRIcNMGWCu3T+tIwzQOGi877bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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