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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1fd07fe1fe99c3be66e0cdceb2574e6bd5d286c8f2cddb36a86bca56b5130eb' 
  AND token = 'zeyb35BJgILN1RoMcN/YVF17r5AZ61WAtrnvb6K1YJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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