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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baecb95031ed2df5248b3717cca7472b5f21cebcf158778b63b57d60951e1e57' 
  AND token = 'mivGTlT5l+SEWM9dCA4UW0u+Cln5fYldPbH8nDzxcXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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