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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb861563f702782faeb8296a84e3f54f74aa8ffd2c575bdfdae371179d9b0266' 
  AND token = '3ePMxfY5wJNYa2B0ejjgYFn1M1eMGQme0sXkp5ODo+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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