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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1b344955461707eb47fea15aeef11fffcfb1b08b2f547696e744b03c10a8793' 
  AND token = '8vYBvOCBXr5EwhRpweZGCL69ORBSpiFDUewF+NoRyos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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