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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '972727cd312c3723b564a3de105fc83180a85628e09570fc952b84ef6c133fc1' 
  AND token = 'v6MH1VzgYNtXBnTg+Bp9bMqLVSsISas2nM0Sw4IiybQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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