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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e118b4ec6de1320a980e4750d7450706b0c7a0e8c047939f0a233ab903802e6' 
  AND token = 'pvzsqiKu5SqTBJwwWztGd91LF+tKYkqFnzeTGTqEbF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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