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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3063abfd6c606a5716691cae2c3d91bd386c414fd46b5db4ea980949a68472cd' 
  AND token = 'zons6ok6nB8Im1rs8oKVygjnFCR+koULOEyk/w9P6Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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