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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2bbd5a9a428b9e2e597f6e63683d63215b26a01d71e748cb92583ff5cafa0bc' 
  AND token = 'XaxCYR6VlgpRMSa01UVSUFu+O8tKl4Z3FQYwzei03zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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