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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b314f2e40547ecd14b4c0cb52c64b342f5450ba5bd197f6c58851aa82ac4267' 
  AND token = 'vAppYntw9fjebMjg7MEmXdFKfWONyL589vbWsC/ifG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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