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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6473a879e5e7cefc8d889f16e16ae7a5832969f3708febf233c86d3b1688548a' 
  AND token = 'JwxTMO6LPlSbKU87g+aHf1zm/RlNfBtDUVJzc8ipXJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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