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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '993c5770ec477f85f3d1e221ebdf15797225bba060609aec0a32ff4e7d7f4bc6' 
  AND token = 'LDx0zB2xhFODL7fRKYq5Nvh5RYvn2VuTXtC5FBpgIK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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