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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a1bd9454c43e8d641e2454979cdec2883c2513c9a62235fe7ba30c038934cee' 
  AND token = 'CZ3cp42XixHn4kcoaFU8g4e1jAuewdmfT8Bd1h6i9iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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