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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '480aace4958bd14f92460e402beb5f87b293cac07b8a28181348f06f8a1c6a21' 
  AND token = 'DNc7EEWOhiiyTEjTjtIbtsha4LRLMa/PYGcHJtU7IcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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