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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b246361e46fd86c3d67ad630e9553428d3b3798e014fb7ee89c907e9e4b3eeb' 
  AND token = 'BUvl/ZtMBck0yOFywjWRbRA41aT1cRP9x7gXKxwF+SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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