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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b77d67551f3a3ce4a4a16554631c746b79f2eb225499f7af2123c10013ac5548' 
  AND token = 'jTLizrLhtQDF9C6Wba+tSXZ3v8rCaDNWxrVN2LcBBsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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