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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbb8b79d16f94537daea69d94aa4c1bd703206f1a9621666acf7b5a1d80120ea' 
  AND token = '1A31p57C2tvzIqyQM7PKlBL53chyQMKh4MOyCQHFrnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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