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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e635483eef7f8acb33fe3761164c5886f71c414f0ae7d56237f989db51104cf1' 
  AND token = '1yJ+pLS1ypVBEX22P+jwt2dLWy7dGpwW7ZHu6S2yxds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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