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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ee044112cfa58d566e8e6a07bfe1998cf78b88e79b7b4e9a19310fedcd1e4f' 
  AND token = 'dFjas7e5/dBuDbG+iaKIqHACTu6G3Zl0Xqfs0N11XJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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