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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b95b57e1d0947e257123fcd83e4f24cbb5bbb9e259ef4b6c5cef6173b0ce16e' 
  AND token = 'gloncN2B/lLyxMcNwrQnoLFNwV8TDhWx1CtCkWxJ3qQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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