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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9435d1505827528d8b58858f70410e650d6e26a7c5e747a5238d964d4e39c187' 
  AND token = 'CX1+pHhS4Cv4+UqTpTlUNrI51EJuIyTDiPJ5gM4Rvj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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