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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7898f20801d7ff34f77bac907ba1c7ff7035803955e5d02d45d74f210e1a6383' 
  AND token = 'LiUY05LJt20Nr9ozCHbN5RRDRhE/OUn1IuA/MJSexoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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