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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b4e8d058b8c60697054f9bc302573ca2f06b23276749539acddb6da635db9b' 
  AND token = '9mr4XflXPctZFs9WKBKNyVeZ09+cbJQ+rTDso+W5XPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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