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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae1e88f6ba782313c9f288a4156a1af8ab4b880b7698036d9efb22cc4cc76496' 
  AND token = '2Tr11oPBU+U19cssP3yT7+ZkTQ8r7I5yqz3BDoiMTHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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