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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '591852d8eae43ccf1504e566d658fa41b23c78847b4dc195aaf1cd0b94b9bdcb' 
  AND token = 'qqgzCZOj6OIuXhEY29vi4Qswn+ekKeetkW62qtCk16c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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