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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3255c9bbe2790021549044eb295fe2b95d5aefbead8c330d35dc774fb3b3109d' 
  AND token = 'qsFRWEI/cYH45xiRryoBynpWmDtq1Pwgd9l4dtFu/Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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