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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92131e3b9627ee13f771e808563bc07d7953ea803d09024845db0a5807da70a6' 
  AND token = 'PDd5FGtakRM4Z/S7sc1jiZ+JoHS1S9rXqbGwv23fhls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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