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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ecb54e4e614db4337cd788948e7984a98af2378a738137cb500fadc73c88be1' 
  AND token = 'X+5gyBSsf+eGkdFJkaXGOL5Im1SiHQj1SNUmvJ43w3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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