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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08a4e9c461b4713c32faa207f4b3ff77a8a1ee9e47a570d684deb0fcfe19d4bc' 
  AND token = 'gXbQN50U8KhcfxPQupqVpDW4esoCNTM8RQU6IXVWrFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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