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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bb6b7e9bd41a9b94ff5897849d5c3812b5177cffc323b3b8bd2859c6d50f6c3' 
  AND token = 'YfTDgQUQzfQFUv9mPxFI9rQRB5G3o/y82h3mlmFYLyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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