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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94dc2bbc274075026d187a702060412332fe22ba7e21833794dcac2b6b007a41' 
  AND token = 'EG+Hfww6kWlNVHvNc/4QotXx44MRDjyTF/yqZjlm1qM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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