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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fd0d747df5f0a9e9d6a4ae3df93c4bb10e9f36df1a0d1f566bb92b83b970f12' 
  AND token = 'PQD+nw/d7DLfSGlH2oKbTgX2oR+/yFypmoe7QnyeQnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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