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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8ef3990b4bf95b80c58004e8df7f669727f04d97c763053b1464a8e6e0ca5fc' 
  AND token = 'Vp5ho5prWUNo3fMOy44LsKfMaDbGQNm7mH9R6+TsRl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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