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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd209d7bfa96f1cd0785956eea22a66fc499bea2c62d81e81843bd9f9fdad9159' 
  AND token = 'wG2wnCHiNuuqyRC8Za46w3jzfETYP2mMEwokBG9GAPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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