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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77435685bd993a41ae3ce52e2bc0e84a9f253fb80118c851142a887b0df04a95' 
  AND token = 'Wlp/SUpToKoImDMlyw61dB5ifPuYf1x8Gj2OwMCvIGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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