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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea9720cc21d6f627586ebeb04c3373aeb4edb992b229b25eb6dd1724667ad41' 
  AND token = 'fzFtEX4W706YrrA7p7ymjee+xktdZetadCYKEsOPlLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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