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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb9b2cd77e224f4a878bd4006229700af7d33c8978931ed28445ed72a739fa0f' 
  AND token = 'n/WuqPSasoSXzvwq6Vh/3Eqr0j8sW97kWPFWEpsIW+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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