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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36c7ab5a527f660b6c3c06d050776bab661752b4cf852520090fc0f104c175cc' 
  AND token = 'iSFzoni9+Cl3noPbJANH5zMs51HYOsBRTFmNNVrtYDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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