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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '029b3cd4903274b4a6d71cfd39bb421140a40f1ce7a92e7d4912a4d7f3e17124' 
  AND token = '6hjKmue0fZ3T3CP1Si7Spvk9GZhhsTE5lecGIZGHyGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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