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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '940557ae2a665a9b9739df3965fc5c14bbaf48d9d052501307ae5252c4be3910' 
  AND token = 'iO3ERJ/7HL18UB/pF6rX9Qv4XH3s6N2UHaFmHbLXsZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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