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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ef05088286bd590d0839e7ea93c58490a8fd3e4b77b78e62951d113814f4d62' 
  AND token = 'K1wjAyYad9LBeofwSy8UKgPxp7J7BGKOaeY9roqoBCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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