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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b108d7eb2dc1f1665b0ae06e8628446e51ba9af6fb68a4a402f22a7e7097d64' 
  AND token = 'WlFz1tvCfhm6bKXhJqFwJSwEU6VR2KAaXH7T9T3stGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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