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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cce3b2f7cc6bfd6a4e8b7fbf1de15d45521c69820731ae7d6ad895dc0e91cf0f' 
  AND token = 'gXPzqtZJ1POLND2LhmVYIGVtIO8TkcfKgmWy2tlv36c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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