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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0884730da85c4a9f3f6200c8ef2c51159a4ee84fc7b118970df1820e1732ac2a' 
  AND token = 'mUDa3Ho7Gw6ktOslHzxqYlhp4LsOWDQeaIboD+N8u6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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