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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be56a3352b45f368507fb276e62471f7409211550e11d69ac49527c2d654cc87' 
  AND token = 'eBBuF25PSKmgJVRilo3vXo7t1qEo1QoVWkZAiOMmbho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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