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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eda1fb27d732f015f0ddca930e0081411a49c3edd7b8ac79cb2fad602d9c46ef' 
  AND token = 'QdijczwqEoD1PNzIGl0crRX+fVjw8+RAxGsIKdrfyHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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