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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0265ed40b35e20c1372facae7100c57834733d4c647bd4413a26ee9d53f23609' 
  AND token = 'm+uJKxBTwgIKmbDT26r5vh0NzYdbjMa0Fh0HTbC09+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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