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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a339a7ee1a122f469351800c139e6ff2e06e3d632085bda090b29bd50b0c652' 
  AND token = '+evRmxZz/6qE4iYHCzLRxOFh6ndiS7rPqIrtyZDXQrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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