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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fe6c28b8af7e37a14cb7fe855c641df08cb2437da3fc90a777c4f5b9f0b37ca' 
  AND token = 'wefklCjoXOaaiUzBnoQsfl7qoHjzIUjK8s1MwE7KTao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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