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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '358c84e6d8d1eaacb0f74c9717edb0735494928cc96e722a93efbfd2e5bd3faa' 
  AND token = '5omJH6b3PsUDmD7wzDXHWvjo9GJ/vASMqIxz6XdA48g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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