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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec61d4fad7f9921cf7228170949a73138a2e3ed1fa1b739d98cae2e2b3e4c0da' 
  AND token = 'OUstKL7qTfpSR9vOh/rNWjrUayH/Zjzm0G9iNFhbxmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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